package orm.utils;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFComment;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.ClientAnchor.AnchorType;
import orm.config.Parent;
import orm.config.SortableField;

/**
 * 利用开源组件POI3.0.2动态导出EXCEL文档 转载时请保留以下信息，注明出处！
 * 
 * @author Ashin
 * @version v1.0
 * @param <T>
 *            应用泛型，代表任意一个符合javabean风格的类
 *            注意这里为了简单起见，boolean型的属性xxx的get器方式为getXxx(),而不是isXxx()
 *            byte[]表jpg格式的图片数据
 */
public class ExportExcel<T> {
	public void exportExcel(Collection<Parent<T>> dataset, OutputStream out) {
		exportExcel("测试POI导出EXCEL文档", null, dataset, out, "yyyy-MM-dd");
	}

	public void exportExcel(String[] headers, Collection<Parent<T>> dataset, OutputStream out) {
		exportExcel("测试POI导出EXCEL文档", headers, dataset, out, "yyyy-MM-dd");
	}

	public void exportExcel(String[] headers, Collection<Parent<T>> dataset, OutputStream out, String pattern) {
		exportExcel("测试POI导出EXCEL文档", headers, dataset, out, pattern);
	}

	/**
	 * 这是一个通用的方法，利用了JAVA的反射机制，可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出到指定IO设备上
	 * 
	 * @param title
	 *            表格标题名
	 * @param headers
	 *            表格属性列名数组
	 * @param dataset
	 *            需要显示的数据集合,集合中一定要放置符合Parent注解的类的对象。
	 * @param out
	 *            与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中
	 * @param pattern
	 *            如果有时间数据，设定输出格式。默认为"yyy-MM-dd"
	 */
	@SuppressWarnings("unchecked")
	public void exportExcel(String title, String[] headers, Collection<Parent<T>> dataset, OutputStream out, String pattern) {
		// 声明一个工作薄
		HSSFWorkbook workbook = new HSSFWorkbook();
		// 生成一个表格
		HSSFSheet sheet = workbook.createSheet(title);
		// 设置表格默认列宽度为15个字节
		sheet.setDefaultColumnWidth((short) 15);
		// 生成一个样式
		HSSFCellStyle style = workbook.createCellStyle();
		// 设置这些样式
		style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
		style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		// 生成一个字体
		HSSFFont font = workbook.createFont();
		font.setColor(HSSFColor.VIOLET.index);
		font.setFontHeightInPoints((short) 12);
		font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
		// 把字体应用到当前的样式
		style.setFont(font);
		// 生成并设置另一个样式
		HSSFCellStyle style2 = workbook.createCellStyle();
		style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
		style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
		// 生成另一个字体
		HSSFFont font2 = workbook.createFont();
		font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
		// 把字体应用到当前的样式
		style2.setFont(font2);
		// 声明一个画图的顶级管理器
		HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
		// 产生表格标题行
		HSSFRow row = sheet.createRow(0);
		for (short i = 0; headers != null && i < headers.length; i++) {
			HSSFCell cell = row.createCell(i);
			cell.setCellStyle(style);
			HSSFRichTextString text = new HSSFRichTextString(headers[i]);
			cell.setCellValue(text);
		}
		// 遍历集合数据，产生数据行
		Iterator<Parent<T>> it = dataset.iterator();
		int index = 0;
		while (it.hasNext()) {
			index++;
			row = sheet.createRow(index);
			Parent<T> t = (Parent<T>) it.next();
			// 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
			
//			Field[] fields = t.getClass().getDeclaredFields();
			List<SortableField> list = t.init();
			for (short i = 0; i < list.size(); i++) {
				HSSFCell cell = row.createCell(i);
				cell.setCellStyle(style2);
				Field field = list.get(i).getField();
				// 如果是静态方法，直接过滤
//				if (Modifier.isStatic(field.getModifiers()))
//					continue;
				String fieldName = field.getName();
				String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
				try {
					Class tCls = t.getClass();
					Method getMethod = tCls.getMethod(getMethodName, new Class[] {});
					Object value = getMethod.invoke(t, new Object[] {});
					// 判断值的类型后进行强制类型转换
					String textValue = null;
					if (value instanceof Boolean) {
						boolean bValue = (Boolean) value;
						textValue = "男";
						if (!bValue) {
							textValue = "女";
						}
					} else if (value instanceof Date) {
						Date date = (Date) value;
						SimpleDateFormat sdf = new SimpleDateFormat(pattern);
						textValue = sdf.format(date);
					} else if (value instanceof byte[]) {
						// 有图片时，设置行高为60px;
						row.setHeightInPoints(60);
						// 设置图片所在列宽度为80px,注意这里单位的一个换算
						sheet.setColumnWidth(i, (short) (35.7 * 80));
						// sheet.autoSizeColumn(i);
						byte[] bsValue = (byte[]) value;
						HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 1023, 255, (short) 6, index, (short) 6,
								index);
						anchor.setAnchorType(AnchorType.MOVE_DONT_RESIZE);
						patriarch.createPicture(anchor, workbook.addPicture(bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
					} else {
						// 其它数据类型都当作字符串简单处理
						textValue = value == null ? "" : value.toString();
					}
					// 如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成
					if (textValue != null) {
						Pattern p = Pattern.compile("^//d+(//.//d+)?$");
						Matcher matcher = p.matcher(textValue);
						if (matcher.matches()) {
							// 是数字当作double处理
							cell.setCellValue(Double.parseDouble(textValue));
						} else {
							HSSFRichTextString richString = new HSSFRichTextString(textValue);
							HSSFFont font3 = workbook.createFont();
							font3.setColor(HSSFColor.BLUE.index);
							richString.applyFont(font3);
							cell.setCellValue(richString);
						}
					}
				} catch (SecurityException e) {
					e.printStackTrace();
				} catch (NoSuchMethodException e) {
					e.printStackTrace();
				} catch (IllegalArgumentException e) {
					e.printStackTrace();
				} catch (IllegalAccessException e) {
					e.printStackTrace();
				} catch (InvocationTargetException e) {
					e.printStackTrace();
				} finally {
					// 清理资源
				}
			}
		}
		try {
			workbook.write(out);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	// public void test() {
	// // 测试学生
	// ExportExcel<Student> ex = new ExportExcel<Student>();
	// String[] headers = { "学号", "姓名", "年龄", "性别", "出生日期" };
	// List<Student> dataset = new ArrayList<Student>();
	// dataset.add(new Student(10000001, "张三", 20, true, new Date()));
	// dataset.add(new Student(20000002, "李四", 24, false, new Date()));
	// dataset.add(new Student(30000003, "王五", 22, true, new Date()));
	// // 测试图书
	// ExportExcel<Book> ex2 = new ExportExcel<Book>();
	// String[] headers2 = { "图书编号", "图书名称", "图书作者", "图书价格", "图书ISBN",
	// "图书出版社", "封面图片" };
	// List<Book> dataset2 = new ArrayList<Book>();
	// try {
	// BufferedInputStream bis = new BufferedInputStream(
	// new FileInputStream("E://book.png"));
	// byte[] buf = new byte[bis.available()];
	// while ((bis.read(buf)) != -1) {
	// //
	// }
	// dataset2.add(new Book(1, "jsp", "leno", 300.33f, "1234567",
	// "清华出版社", buf));
	// dataset2.add(new Book(2, "java编程思想", "brucl", 300.33f, "1234567",
	// "阳光出版社", buf));
	// dataset2.add(new Book(3, "DOM艺术", "lenotang", 300.33f, "1234567",
	// "清华出版社", buf));
	// dataset2.add(new Book(4, "c++经典", "leno", 400.33f, "1234567",
	// "清华出版社", buf));
	// dataset2.add(new Book(5, "c#入门", "leno", 300.33f, "1234567",
	// "汤春秀出版社", buf));
	// OutputStream out = new FileOutputStream("E://a.xls");
	// OutputStream out2 = new FileOutputStream("E://b.xls");
	// ex.exportExcel(headers, dataset, out);
	// ex2.exportExcel(headers2, dataset2, out2);
	// out.close();
	// JOptionPane.showMessageDialog(null, "导出成功!");
	// System.out.println("excel导出成功！");
	// } catch (FileNotFoundException e) {
	// e.printStackTrace();
	// } catch (IOException e) {
	// e.printStackTrace();
	// }
	// }
	
	

	public static void download(String path, HttpServletResponse response) {
		try {
			// path是指欲下载的文件的路径。
			File file = new File(path);
			// 取得文件名。
			String filename = file.getName();
			// 以流的形式下载文件。
			InputStream fis = new BufferedInputStream(new FileInputStream(path));
			byte[] buffer = new byte[fis.available()];
			fis.read(buffer);
			fis.close();
			// 清空response
			response.reset();
			// 设置response的Header
			response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));
			response.addHeader("Content-Length", "" + file.length());
			OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
			response.setContentType("application/vnd.ms-excel;charset=utf8");
			toClient.write(buffer);
			toClient.flush();
			toClient.close();
		} catch (IOException ex) {
			ex.printStackTrace();
		}
	}
}